my university paper was technical comparison between lcd and plasma.
the real answer is that it really depends on your needs.
plasma is a little better for sport applications(fast pace movies)
LCD is better for brighter room,,has much longer life span and uses 1/3 electricity as plasma and has a crisper image.
for gaming:
definitely LCD,,,,plasma will have burn in effects,,meaning that if you live the pause menu for an hour to 2 hours on,, there is a high chance that the picture will burn into the screen forever.
overall I think LCD is better and 2 top LCD manufacturers are Sony and samsung. just make sure that the screen is not shiny (most of samsung tv screens are shiny meaning that they lose picture quality if the room is even a little bright)
My recommendation is Sony 40XBR4.